Visible setting control mechanism



March 6, 1951 c. HERZSTARK 2,544,426

VISIBLE SETTING CONTROL MECHANISM FOR CALCULATING MACHINES Filed April29, 1949 to each other.

Patented Mar. 6, 1951 VISIBLE SETTING CONTROL MECHANISM FOR CALCULATINGMACHINES Curt Herzstark, Mauren, Liechtenstein, assignor to OontinaBiiround Rechenmachinenfabrik A. G., Mauren, Liechtenstein, a firm.

Application April 29, 1949, Serial No. 90,342

- InAuStria. May 15, 1946' 2 Claims.

. 1 In the known types of calculating machines with slidebar setting andVisible setting control register, the setting mechanism and the controlmechanism constitute two devices entirely separate from each other butmutually connected by special coupling members.

The object of the present invention is to simplify the setting mechanismand control mechanism to the greatest possible extent as compared withpreviously known types, and to accommodate same in the smallestconceivable space such as is available, for instance, in a pocket-sizecalculating machine. To this end the setting members for the settingwheels are, according to the invention, mounted in such a way on theshafts carrying the control numeral rollers as to be axially movable andare coupled to said shafts. Accordingly, when the setting members areoperated. the control numeral rollers are positively rotated, so thatthe figure set is visible in the window of the setting control register.

The drawing shows a typical embodiment of the device in accordance withthe invention, in which drawing Fig. 1 shows the combined setting andcontrol mechanism of one column of the calculating machine inconsiderably enlarged vertical section, Fig. 2 an appurtenant frontelevation and Fig. 3 an elevation of a detail.

In the retaining plates I of the body of the calculating machine, theshafts 3 of the control mechanism and, behind them, the shafts 4 of thesetting mechanism are mounted in the vicinity of the wall 2 of the case;only one of each of said shafts is illustrated in the drawing. Thecontrol numeral roller 5 is rigidly mounted on shaft 3, on e which shafta setting member is so mounted as to be longitudinally slidable. In thecase here depicted, said setting member is a slide-bar 6 which projectson one side, by a handle or knob I, from a longitudinal slot 8 on thewall 2 of the case, and

is provided on its other side with a projection 9.

Said pro ection 9 is provided (Figs. 1 and 3) with two bifurcations 9a,9b ofiset at an angle of 90 The slide-bar 6 is coupled, in the axialdirection of motion, to the setting wheel H] of the relevant column bymeans of the bifurcation 9a, whilst said slide-bar laterally embracesthe bearing Illa of said setting wheel by means of recesses 912 providedin the outer ends of the bifurcation 9a. As a result of this lateralembracing of the setting wheel the slide-bar 6 is held in a simplemanner, without the use of special guide means, against rotary movement.The setting wheel [0 is fixedly mounted on the bearing Illa which latteris so keyed to shaft 4 as to be slidable in the lengthwise direction of,said shaft, and is;

driven, when a numeral has been set, by the driving member, for exampleastepped roller H. The slide-bar 6 is retained in the set position by aretaining device. Said retaining device preferably comprises a ball l2mounted in the hollow knob l and loaded by a compression spring l3 alsoaccommodated in said knob. In the drawing the s1ide-bar 6 is shown inthe zero position.

in this position, the ball l2 engages in a recess M in the shaft 3 andby the action of the spring l3 retains the slide-bar 6 with ufiicientfirmness to ensure that said slide-bar can only be moved by overcomingthe pressure of said spring.

The slide-bar '6 is positively connected to the shaft To this end theshaft 3 is provided with a spiral groove I 5 into which projects aradial pin iii of the slide-bar 6. Along a curve corresponding to thespiral groove l5 are provided, in addition to the recess l4corresponding to the zero position of the push-bar. nine furtherrecesses 14 for the Figures 1*!) which may possibly be set. Thelongitudinal slot 8 serves at the same time as a sight hole for thecontrol numeral roller 5 and is of such width'that only one figure 0nthe roller 5 is visible.

In the device described, when the slide-bar 6 is displaced, theten-figure numeral roller 5 is rotated according to the figure operated,so that the combined figure set can be readily seen in the sight holesand. if it has been wrongly set, corrected before being transferred tothe counting mechanism.

To enable the entire unit, i. e., the shaft 3. the push-bar 6. theretaining device l2, l3 and the numeral roller 5 to be laterally removedintegrally from the machine or integrally placed therein without itbeing necessary to unscrew or otherwise move the retaining plates l, theshaft 3 is mounted on centres I! constituted by the free ends of screws18 fitting in threaded holes in said plates I. With this svstem ofmounting. the shaft 3 with the setting wheel l0 may also. if required,be finely adjusted to the driving member II.

I claim:

1. In a calculating machine, a setting mechanism with visible settingcontrol register setting members for setting Wheels, the said settingmembers being so mounted on shafts carrying a control numeral roller, asto be axially slidable, the said setting members being coupled to saidshafts, so that when the setting members are operated the controlnumeral rollers are simultaneously and correspondingly set, the settingmembers consisting of slidebars provided with lateral extensionsprojecting toward the center axis of the machine and having twobifurcations, said bifurcations being provided with a recess at theirouter ends, said extensions being coupled through said bifurcations inthe axial direction of movement of the setting wheels, while slidablebearings on which the setting wheels are fixed, are received by therecess of said bifurcations whereby said setting members are heldagainst rotation.

2. In a calculating machine, a casing having a wall provided withstraightlongitudinally extending slots, a setting mechanism with visiblesetting control register setting members for setting wheels, rotatableshafts on which said setting members are slidably and rotatably mounted,handles on said setting members and extending through said slots, acontrol numeral roller fixedly mounted on each of said shafts, a spiralgroove in each shaft and pins on said setting members projecting intosaid grooves, and a plurality of recesses extending along said spiralgrooves in said shafts and engageabie by a yieldable member carried bysaid setting member, whereby upon slidable adjustment of said settingmembers by means of said handles, said control numeral rollers aresimultaneously rotated and set, the setting members consisting ofslidebars provided with lateral extensions projecting in the oppositedirection from said handles and having two bifurcations, saidbifurcations being provided with a recess at their outer ends, saidextensions being coupled through said bifurcations in the axialdirection of movement of the setting wheels, while slidable bearings onwhich the setting wheels are fixed are received by the recess of saidbifurcations, whereby said setting members are held against rotation.

CURT HERZSTARK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 938,790 Rein Nov. 2, 19091,011,617 Hamann Dec. 12, 1911 2,482,935 Rast Sept. 27, 1949 FOREIGNPATENTS Number Country Date 256,315 Germany Feb. 5, 1913

